The new style ETM has been much better so far. I've not seen or heard of any problems with them but unfortunately for those with older pre-'02 cars, the new type ETMs will not retro onto the older cars as their are too many differences, mainly electronics that simply make that swap impossible.

As for Volvo correcting their mistakes, ONLY in production as time goes on. They usually don't ever go back and make better parts for their older cars UNLESS it becomes a campaign or recall item.

Every car, Volvo or otherwise has its known problems which are often realized soon after the car is sold. When under warranty, the parts and labor are covered but after that the owners are SOL.